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A unanimous Supreme Court on Tuesday, December 6, 2016, sided with the government in a legal clash over the nation’s insider trading laws, a victory for prosecutors seeking to curb corruption on Wall Street.

The justices ruled that sharing corporate secrets with friends or relatives is illegal even if the insider providing the tip doesn’t receive anything of value in return.

The ruling upheld the conviction of Basaam Yacoub Salman, an Illinois man convicted of making investments based on inside information he received from a member of his extended family. It also limited the impact of a 2014 ruling from the federal appeals court in Manhattan that had raised doubts about the scope of insider trading laws.

Prosecutors have relied on a broad reading of the law to support aggressive anti-corruption efforts that have netted more than 80 arrests and 70 convictions for insider trading over several years.